12021011011 has 4 divisors (see below), whose sum is σ = 12140031024. Its totient is φ = 11901991000.

The previous prime is 12021011003. The next prime is 12021011021. The reversal of 12021011011 is 11011012021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12021011011 - 2³ = 12021011003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021011021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59509855 + ... + 59510056.

It is an arithmetic number, because the mean of its divisors is an integer number (3035007756).

Almost surely, 2^12021011011 is an apocalyptic number.

12021011011 is a deficient number, since it is larger than the sum of its proper divisors (119020013).

12021011011 is a wasteful number, since it uses less digits than its factorization.

12021011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119020012.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 12021011011 its reverse (11011012021), we get a palindrome (23032023032).

The spelling of 12021011011 in words is "twelve billion, twenty-one million, eleven thousand, eleven".